71787473 has 2 divisors, whose sum is σ = 71787474. Its totient is φ = 71787472.

The previous prime is 71787449. The next prime is 71787497. The reversal of 71787473 is 37478717.

It is a balanced prime because it is at equal distance from previous prime (71787449) and next prime (71787497).

It can be written as a sum of positive squares in only one way, i.e., 43665664 + 28121809 = 6608^2 + 5303^2 .

It is an emirp because it is prime and its reverse (37478717) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 71787473 - 2⁶ = 71787409 is a prime.

It is not a weakly prime, because it can be changed into another prime (71787173) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35893736 + 35893737.

It is an arithmetic number, because the mean of its divisors is an integer number (35893737).

Almost surely, 2^71787473 is an apocalyptic number.

It is an amenable number.

71787473 is a deficient number, since it is larger than the sum of its proper divisors (1).

71787473 is an equidigital number, since it uses as much as digits as its factorization.

71787473 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 230496, while the sum is 44.

The square root of 71787473 is about 8472.7488455636. The cubic root of 71787473 is about 415.6070334480.

The spelling of 71787473 in words is "seventy-one million, seven hundred eighty-seven thousand, four hundred seventy-three".